Th2 cells, or T helper type 2 cells, are a subset of T cells that play a crucial role in the immune system. They are primarily involved in the body's response to allergens and parasitic infections. Th2 cells produce specific cytokines, such as IL-4, IL-5, and IL-13, which help activate other immune cells, including B cells and eosinophils. These cytokines promote the production of IgE antibodies, which are important for fighting off parasites and are also associated with allergic reactions. Th2 cells help regulate inflammation and contribute to the overall balance of the immune response, ensuring that the body can effectively combat various pathogens.